Portion of a monitor



FIG. 1 is a front perspective view of a portion of a monitor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the remainder of the monitor is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a monitor, as shown and described. 